SIM Card: standard 6 PIN SIM card interface, compaliant with 3GPP 31.101 and 31.102(Use of micro SIM card with adaptor to mini SIM card size is not supported due to thepossibility of damaging the SIM card reader pin on the modem. Under such circumstances, the warranty for the device will be voided)Built-in Micro-SD card slot supports up to 64GB memory card